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[Valentin]

Hi everyone,

I'm planning to change the oil cooler this summer, in the same time as the thermostat box, before anything break I prefer to be preventive.

The only cooler I found is the improved one from ACS Parts

https://acsparts.biz/en/maslookholodzhuvach-90412391-opel-saab.-nerzhaviiucha-stal/?srsltid=AfmBOoph8Efr1gX13rbQ8HyG-FO_OTtma1wOa0Sfhz6-D5pgFHYR-25X

Does anybody tried this cooler from them ? It looks made in a better way, especially the material which is stainless steel, while the OEM one is made of aluminum if I'm not wrong.

[TheBoy]

Never used that one.

You may wish to replace the oil cooler plate at same time, as these sometimes corrode and leak.

[TheBoy]

I should add the latter GM oil coolers were stainless, so tend to be more corrosion resistant than the earlier ones. I think the changeover point was around 1997?

If you have a stainless one, and keep on top of coolant servicing, they tend not to give problems.

[Valentin]

When I changed the timing belt I could see some limestone deposits around the thermostat box and the cooler plate. I have no oil in water yet, but I really want to avoid any cooling issue as I'm using the car to travel through France once every two months, from north west to south east (total of 2400kms).
Mine is a '96, pretty sure it's not stainless steel.

[ronnyd]

When I changed the timing belt I could see some limestone deposits around the thermostat box and the cooler plate. I have no oil in water yet, but I really want to avoid any cooling issue as I'm using the car to travel through France once every two months, from north west to south east (total of 2400kms).
Mine is a '96, pretty sure it's not stainless steel.

That's quite a trek for a near 30 year old car. Fair play to you.

[Valentin]

I bought the car for this purpose. My GTC eats 2400kms per month and I wanted to divide this by two with another car, which could be at the same time a very comfortable and original car.

First I wanted a C5 2.0HDi Hydractive but I found this Omega. 2 of my friends converted their V6 to ethanol and I know it works perfectly. So, next move is to put 6 z20let injectors, and fully refurbish the cooling system. With cooling and timing belt kit all new, I can drive with peace of mind.

Even if today, the car seems to cool down properly on regular road, it has some difficulties to regulate on mountain roads or traffic jam. Especially when I'm stopped, the gauge reaches 100°C, and even with the fans ON, hardly cool down, until I bleep the throttle a little bit, at this moment the gauge moves down to 95°C. Like if the rpm moves the coolant faster in the radiator and the bloc. Looks to me as an abnormal behavior from the cooling system. The car should cool down without the help of rpm's increase.

Let me know if you guys have the same experience of it